Poor communication

On 25 th May I bought an online voucher from KFC. Unfortunately for me at the time of purchase i was in Saudi Arabia. Whilst purchasing the voucher i placed in my Saudi mobile number and my email address. I received no such voucher. I then proceeded to email KFC customer care , who did respond by asking for the mobile number I asked for the voucher to be sent to. I responded and that was it, never to hear from them again. On landing in SA I phoned the call centre and spoke to an agent who then asked of I have a case number. I told her that I was not given a case number when emailed. She then asked for my SA mobile number and said she will find out and get back to me. Nobody ever did. Ok , the voucher is only for 500 ZAR. But KFCs communication is extremely poor. How can I get my voucher, please?